National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 3

Two containers X and Y, of the same size and thickness, contained 1000 mL and 600 mL of water, respectively. Both were heated over two separate flames till the water in them boiled.
If the water used in both containers took 10 minutes to reach boiling point, what conclusions can be made?
1. The flame used for container X is stronger than that used for container Y.
2. Container X is better conductor of heat than container Y.
3. The water in container X was colder than that in container Y at the beginning of the experiment.

A 1 only
B 2 only
C 1 and 2 only
D 1, 2 and 3


Ans 1:

Class : Class 3
D

Ans 2:

Class : Class 3
C . (1and 2 only)

Ans 3:

Class : Class 3
C . (1and 2 only)

Ans 4:

Class : Class 3

Ans 5:

Class : Class 3
C . (1and 2 only)

Post Your Answer

Subject :NSO    Class : Class 3

Two containers X and Y, of the same size and thickness, contained 1000 mL and 600 mL of water, respectively. Both were heated over two separate flames till the water in them boiled.
If the water used in both containers took 10 minutes to reach boiling point, what conclusions can be made?
1. The flame used for container X is stronger than that used for container Y.
2. Container X is better conductor of heat than container Y.
3. The water in container X was colder than that in container Y at the beginning of the experiment.

A 1 only
B 2 only
C 1 and 2 only
D 1, 2 and 3


Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
B

Ans 2:

Class : Class 6

Ans 3:

Class : Class 6
b

Ans 4:

Class : Class 5
Answer is B.

Post Your Answer

Subject :NSO    Class : Class 4

Avinash grouped plants on the basis of their habitats. By mistake, he placed one wrong plant in each group. Identify the odd member of each group and select the correct option.
Group I : Duckweed, Hydrilla, Opuntia
Group II : Banyan, Mango, Acacia
Group III : Barrel cactus, Joshua tree, Vallisneria

A Duckweed in group I is incorrectly placed and should be replaced with arrowhead plant.
B Mango in group II should be interchanged with Joshua tree in group III.
C Opuntia in group I should be interchanged with Vallisneria in group III.
D Banyan in group II is incorrectly placed and should be replaced with gulmohar.


Ans 1:

Class : Class 4

Post Your Answer

Subject :NSO    Class : Class 3

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4

Post Your Answer

Subject :NSO    Class : Class 4

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
You have to specify if waxing or waning crescent

Post Your Answer

Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
Please explain it. I am also confused about the answer. I myself did B.

Ans 2:

Class : Class 8
The answer key says that X will not light up,but why?

Ans 3:

Class : Class 8
X will light up... I think it's incorrect....

Ans 4:

Class : Class 9
I too am confused as current will also flow through both the bulbs when circuit is closed. It will pass through the switch first and hence lighting up bulb Y.

Ans 5:

Class : Class 8

Ans 6:

Class : Class 8
yes i too did B

Ans 7:

Class : Class 9
Yess,my answer was B also

Ans 8:

Class : Class 6
The answer should be B as it will be closed circuit

Ans 9:

Class : Class 8
logically it should be B but sof says otherwise. why ????

Ans 10:

Class : Class 8
The answer is B

Ans 11:

Class : Class 9
Option D is correct because current prefers the path that offers less resistance. The bulb provides resistance whereas the switch when closed does not. Hence correct answer is D

Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
The answer is c

Ans 2:

Class : Class 5

Ans 3:

Class : Class 4
Low High Many Many

Ans 4:

Class : Class 4
d

Ans 5:

Class : Class 5

Ans 6:

Class : Class 5
Sorry , my brother changed the C into D . It should be C only !

Ans 7:

Class : Class 5

Ans 8:

Class : Class 5
It is a very serious thing for us that we are getting wrong answers from SOF . It should be D only !

Ans 9:

Class : Class 5
The answer is d

Post Your Answer